From: Mark Salter Date: Wed, 25 Mar 2015 14:17:50 -0400 Subject: [PATCH] arm64: avoid needing console= to enable serial console Tell kernel to prefer one of the serial ports for console on platforms currently supported (pl011 or 8250). console= on command line will override these assumed preferences. This is just a hack to get the behavior we want from DT provided by firmware. Signed-off-by: Mark Salter --- arch/arm64/kernel/setup.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index e8420f635bd4..84733810614c 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -547,3 +547,22 @@ const struct seq_operations cpuinfo_op = { .stop = c_stop, .show = c_show }; + +/* + * Temporary hack to avoid need for console= on command line + */ +static int __init arm64_console_setup(void) +{ + /* Allow cmdline to override our assumed preferences */ + if (console_set_on_cmdline) + return 0; + + if (IS_ENABLED(CONFIG_SERIAL_AMBA_PL011)) + add_preferred_console("ttyAMA", 0, "115200"); + + if (IS_ENABLED(CONFIG_SERIAL_8250)) + add_preferred_console("ttyS", 0, "115200"); + + return 0; +} +early_initcall(arm64_console_setup); -- 2.1.0